The difference is Patek & Rolex actually sell quick at Costco. The costco I been to have the same Panerai for months. Check the serial number come back 3 months later check again will be the same ones. The prices are still high compared to market prices for the same models.
Unless there is a merger of the two companies. It will be more likely Rolex will release a radomir style case before Panerai puts a Rolex movement in their watches again And remember the 21s were tough to sell and sold below retail.
If Panerai waited 5 months, they could have waited a few more to engrave the movements. Plus More 318s were sold out of BH so it was really not a NY boutique edition. Do not remember the exact date of release but on 6/23/2009 I was contacted by the boutique manger asking who was flipping the 318. Of